 Reinforcements for the defenders came en route from Buenos Aires, so that the rapid success of the operation was essential.Meanwhile, at the other side of the peninsula, on which the Old City of Montevideo stands, the 87th Foot (later Royal Irish Fusiliers) were waiting together with a company of the 95th at the city's second main gate, the San Pedro gate.On hearing the noise of battle inside the walls, the 87th were unable to wait for the gate to be opened for them by their comrades, according to the plan of attack.